Internal combustion engine

Abstract

To improve a propagation speed of a flame by effectively utilizing energy of the electromagnetic wave in the combustion chamber in an internal combustion engine that promotes combustion of fuel air mixture in a combustion chamber by means of an electromagnetic wave. The internal combustion engine includes, in addition to an internal combustion engine main body and an ignition device, an electromagnetic wave emission device and a control device. The electromagnetic wave emission device emits an electromagnetic wave to the combustion chamber while the flame is being propagated after ignition of the fuel air mixture. The control device controls a frequency of the electromagnetic wave emitted to the combustion chamber in view of a resonant frequency of the combustion chamber in accordance with an operation condition of the internal combustion engine main body or a propagation condition of the flame.

What is claimed is: 
     
       1. An internal combustion engine comprising:
 an internal combustion engine main body formed with a combustion chamber; 
 an ignition device igniting fuel air mixture in the combustion chamber; 
 an electromagnetic wave emission device that emits an electromagnetic wave to the combustion chamber during a propagation of a flame following the ignition of the fuel air mixture; and 
 a control unit configured to control a frequency of the electromagnetic wave emitted from the electromagnetic wave emission device in view of a resonant frequency of the combustion chamber in accordance with a load or rotation speed of the internal combustion engine main body. 
 
     
     
       2. The internal combustion engine as claimed in  claim 1 , wherein the control unit is configured to increase the frequency of the electromagnetic wave emitted from the electromagnetic wave emission device as the load or rotation speed of the internal combustion engine main body becomes higher.